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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35d737e4333f4ca497602e71a8af4f65e7185cc328b7e95416adbbf1238f6dc8' 
  AND token = 'pPnODkmue3ZAujhWW6R+mo84VndaMk3Ojld7BUe+Lwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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