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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620d1f974cc2cc8bf5ab65996d9798df55fbbe5a4a07c3d089c6636f65d11f09' 
  AND token = 'vbKTupCinUsuc5H3nIvhjM2He2av7lOE9yxF2qBfYF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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