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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac0a44550e1d182246791139a8953f33c4260ff89374adf89b4ba0060588e40' 
  AND token = 'QE/JrGkrxgkDYxK7w3JK4AFbvsEUT44pSeljKoPyV/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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