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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6fb9aad9a7e7fbe4e2924add2166d2789b9cfe7fdb2d659a4b795010bc7b11b' 
  AND token = 'DMduvop4piXqDN2zu3zRaB8Zcazl4wcedJ/hma54jwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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