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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c705d57e1da54bdb8c94abe5501f72feb8f5cbb6d8c7811c07b98c3913a000fc' 
  AND token = '/vbnsltxLRP+DAH/yQseYta8R31HSMyK5lWs1p+x76s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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