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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2edb2a72bbcd7d3370e2761dc3790d9ed14ec6e07ed57c8eb89e8a0b03acfcd1' 
  AND token = 'ETKc9ZE/aPFmxeR4rXfv59C1xnTDU72StB1Frqb5tAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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