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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ab160eae7888633cd3b415165e4b5b89ae1698b13ae3f01a0f0b699f8934e8' 
  AND token = 'rQ25P3Hps4yULTRh9yXj9zpYuAAsbS4Cuv6rq+LImp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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