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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0903a85e7532ff3de8202e9e21979e50a44fa998a9283b7d8c45fd4b7a6eb266' 
  AND token = 'a0pcmeFmU/qUVdPRJ7jCrU2l4kk+YUJFaGZ1uzL8uU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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