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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2ba8e8975bd2fac33e0c850752363da10848fb50f66436deaa12a3e70e8f3e' 
  AND token = 'k7qHC/n0vbU3a2uLtTmWVrJxT3dAl4S+bac7mPzLCdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}