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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '249a7a4e8ad67dd08b1fa4438c25bb3b7fffac7a7e4ecda21f5b793ac4ace6d1' 
  AND token = 'zvmK8A+jS8Y4dNu6aBrPYWv5KrsL9zn1Ux/BEebtcT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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