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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e7fff356d59bb75ff02fa71c94027f10929adc1bc93a0aaeb78cb173c19aaf' 
  AND token = 'BXrdxdEJ82YYDk7BHbREWt8zkeyAtTYmOf0K6E55TBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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