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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf5efa7f784e2c898954bfe7f7a915e5d178643a9a5dcfeed8cc0143033b888' 
  AND token = 'P9E2JVMLRNegr5q7HbWqpViSL+yrA2ZQlyE6aIF+CsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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