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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d05a6b15fc2a8e91bdbd35dcb9dc532c1e429697be7ce46bf7feb2131b912ee' 
  AND token = 'TGVvLQg2/dQcs3F9rHI/BcQsfxbEJHSOIKfLpi5F7hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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