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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd683c3ecb519806ce21f3c8264bdec0ee9f788721d9e7a34a8a9e77c8b4e41' 
  AND token = 'slsaeemaSnXqLXWI9MbouQifJivy2hmIe4dYaR4dhUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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