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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccc347de45edc812c6d3a7338a328a01f89e566ca000c97e0a18f6c4119ca61' 
  AND token = 'F7c6EnupJElqhLyU/f6ukPXtMxa7wKZJ656gHQ6ior0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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