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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0beeb0f7a875689ecfe89c00039687c3e797f8a7a9c258c72a524c0754c297e6' 
  AND token = 'bGPwFIJCy5Of7Yi8EkYmOMhhm0q3ObXmu8Oi3qjkjwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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