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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c7968081d89e2966d002c09ccbe62b4316e3249cad42346c41752d764f27a5' 
  AND token = 'cupdaW9vSBPo8yNrFRlNdrs834bPehH7jfXGoN8VuEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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