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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6bfbf3b4e2ac97f025dfab72fe26128b8a3cc9f4e1bb285c91bdc9de71ac38' 
  AND token = 'yH2LQDU0frdMDKJwE9p4ksh00dq6OM4EQTiO83HfYzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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