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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dab312fc75900f2e61bfa15b165811c739214126413e2ce130d52254846c1f9' 
  AND token = 'rxbX9PQtXWjqbNcQkm6y5SFAPFiS1Zi8LOYHnl5P1XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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