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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad1c98fff9a3925b540980d46d45f30d544b5a66c9669314264c120b1fa43b7' 
  AND token = 'NG5rtoln8Y5EjTiF5yZiBziN5XzNZ6HreKsS8qUpoxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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