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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae93ac2b12550cc32984de05cdafabd220316e7407542088995364e4cd35fcc8' 
  AND token = 'iROPn9V0i3dOdVU8x90XME5HnRXkBD/ogzbCo2KySn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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