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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41aa03d7edb2e2ca73fd5b30ecee8665aab83630cb31d4d4e2ff216991e22755' 
  AND token = '+KzeX5mcBdtMOGPUeHIZ0D4aH+zyIPzZ/NcQIk+gQwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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