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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7697d47bca73e79881ee3444677d08d2bc1183ebc9e62e088bf1e9ef005ad040' 
  AND token = 'jlZ+Nt1Rd9OOY4lkHRBwAhj//bvQfDNRT03BdY8C51U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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