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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5588a99832879f62d2080895e22899ec1921319f84335ec4475c1c95a9378c' 
  AND token = 'AralJWJmYDSsQ4qGW/61S9mvob4ugUBUCSLtTpg1544=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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