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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77ff94d19719985bb1b30926aec753b94c0ff008be741bfce74f7b1467203cb' 
  AND token = 'kGiOClYLoz5xim0QOulHHKoVOgS3tit8UkCn22DioP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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