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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3cd3f750f21aae10a609e063e810cc3ff89d908ba62176ab4ee1b9f5bc76054' 
  AND token = 'R/r/cwUv8iQQa7guE7Ria/cDLKJD658ha/6JocuVH+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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