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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6b3e623d1194830efd079ff7965f16155871a8e4e8828b9570f41643593955' 
  AND token = 'jOib136Myz/8rczftSo33nbLBnYRPMiigIQ302RaUNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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