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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e3c6a3ae739182fceb67513818597668aab2c2d1d14fc7b005b06b6b315508' 
  AND token = 'XsLFT8sAEci/o1yYTyqsZat+leP7Q9AebPWLDPIOFqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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