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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2498bd75ff0818a3a6b19c12678706438b4fe0677c9e6ea0133fcd160eb0c42a' 
  AND token = 'uDlcJVALAulzo6k3t2G4V2MJGxg8o7BtdlwCSm1Wgxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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