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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d64d841cc4bf3573a2e03437c4e3a12c7ae79a32b80542d18f12a8db5898c9' 
  AND token = 'toI/JiZ6LN6tca3XQZ+dj5IcaAUatDr+SiZnM3lTIEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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