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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd04f5b2a56eb9f9c7f4f1617a551db01ca12d6e4a2dcfc6598d7a20c1a75a8' 
  AND token = 'WPQfdHSF6ioU4eeyo2TWS6/GaCyuYSSRJa/lokGSVmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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