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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d933d94718b6bf882ef7621ad28e90392246d83846cb82045a73aca8b01958' 
  AND token = 'q7Un+kTQu8T/AysSyBw3eWIzDpRDzSPlndxDHMCHg/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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