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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4113331c0568d9588e10913d66b331da05606ec51ba95bc4618207f9a696d49' 
  AND token = 'v2ouy8B0SGVAebpesaTHS0gEhDoOqQc01F9hzyOrDHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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