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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba21ad626d37d959e85aa35548fb23e091cc1fd5e4288e4eeb0a23fac5e33cc' 
  AND token = 'Da5kYHZYK/3+z37uWZ+WIaEVxJPWx/VaS1o3zHgx9vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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