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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9fddd04d36d8f32180774f94677283762331bd0fb2d89d344f339929cffabf0' 
  AND token = 'vk9sc8QPlNavLRQrJPwWgNhU50WgN0vXqVAKbf4Ss5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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