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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305bf7d5eb4cfed12b1394b9d3c63e9e2182f595fcd352a5d059a6ebf0f64d98' 
  AND token = 'xhoS3P1ivSAL2fkBgwRyiU35OjfFqFThSLkip6Ee4yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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