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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c87996e2817b6f9823ae327984d5aac4e8233dd31ba1358851d42ad8a1ace9' 
  AND token = 'WCh7POR5g2ysC3hNr+Mz5ZXCi0vGv/R70fvtj3mwEOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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