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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '225c5a7c83078fbc8a706b85e51529e0bbfd59f22eca38d12595a3dc0027f540' 
  AND token = 'Utr5JFHwkaRuo7yPu0P6TuQW2tqJ1kxWBTKB898GiW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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