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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e2f6cd5222c90f47d961b178f86a4e8968989fd90f392fcd004299fa241132' 
  AND token = 'xPOPRbjJQE+EAtbFv6kkTgAsJ6SBD7+i7t4utEuCnL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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