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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e523d5dd971943c8851b17dbf173e1caa04fb6c953a1344c6db40b461e3ce3' 
  AND token = 'k5HHvvg8MbZxv6/pY2/ZbUHT3ThioT603d446YqZhHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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