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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10fb2e89a6fed5d0249a468a1bd0862818dd39c2ac568bfb9b081f3935be4fc6' 
  AND token = 'bUKwMFIs0IJ8TdtWv6/p3qZflCKifuegjMrdF32+pEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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