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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d57d16e29c78713a316e63e23f1b5283cfe651330d157326ea271407b5b76ca' 
  AND token = '7643R4WUJ7J9vtrKJxii7sP7MW2gRJFf+UcMG/mcKEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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