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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf88bf9023d4b1ff8736eb5565d920ed4a699b87ffb80879755f298ce258b7c5' 
  AND token = '1mUhsYNsegRb7ZYk4GnodgbrC+WPYVQpa6DH3pSRycw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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