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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4fba9fb481e5fbfa9ebcc1b74dfe6cd7b02f5c36a1ff180909728edeabec078' 
  AND token = 'sWcYY7bmFiqceJ+1gZI9Zs5cJYgTTcN+qb8P7vqLTyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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