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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979f57a1aecf342f3fb29845051c9f2491bf42ed92d97b3cbf5274c836620942' 
  AND token = 'xbh1iF6eplFWq/OGix/9wfGG38G1hWK4Wwe8Hd4o5Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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