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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1f27db9198286a957ba8f391d78e16d6529f49573bce2ec7e3943977b81205' 
  AND token = 'MS1qFwvF1O7fH+VpN8aKmO9RcX0sJ5zaF6sSUIXzfgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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