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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5861b7f8b4092ced92f71f02b2601cabbf2e933a6053770c5a851265a7efc3' 
  AND token = 'EDEL/pK3cF160EB2KrW3xaM+REuCvJ4ntf0ZofB+E6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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