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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718d279f4c1974af3d5599922d7f46a567133ca537647f5c590282a46bec9be6' 
  AND token = 'dh5EsW2OHOi8WFr7RhkBP9PHypfCA6XwU0muqt+rXok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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