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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da07f13ca1e2e615ba929f0a7a88207bb1e4ae384cbb62dc295d3738a736723c' 
  AND token = 'X1lRMIDji2VPF9uzupdSwuy8ylgoGQr99B8tP+rORNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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