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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2d38bb338655226e4a66799838cf75be9b7cf8f12c7f1370bad81149127557' 
  AND token = 'xeJeEbmogUlyE1W0gCM0sLhKwx0yn9YjYpnxd6Iwnvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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