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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790bca1740df4308d0fa00e8163f1a5f9982def30bc71a3e647257bc298ebdb3' 
  AND token = 'IfHVnUpJeHMhVWi9us9t85cWoY6796CRsR7IebKQwwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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