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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d09460cd74f210619ed55367d90fd78d46dc8469a1f371af1da50a88cde53c0' 
  AND token = 'nd8XMbVvkW9G2eFdMlDTGhAobcjGzy5k1gmdyAR0+CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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